Hi doctor . trying for pregnancy. My last period date was 11 Jan. Had unprotected intercourse on 22,23,24 Jan. but on 24th got little blood flow. But again from last two days feeling lower back pain and still bleeding is there... bleeding is not heavy compare to period but it's  not spotting also... I am worried...is it period? Or its ovulation bleeding..how much day bleeding will be there? Please help me out.